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Presence of any VM_PROT bits in the permission argument on x86 implies

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that the entry is readable and valid.

Reported by:	markj
Submitted by:	alc
Tested by:	pho (previous version), markj
MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2014-09-17 18:49:57 +00:00
parent ae9e9b4fda
commit 490356e5b7
2 changed files with 4 additions and 2 deletions
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3
sys/amd64/amd64/pmap.c
View File

@ -3845,7 +3845,8 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
pt_entry_t *pte, PG_G, PG_M, PG_RW, PG_V;
boolean_t anychanged, pv_lists_locked;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
KASSERT((prot & ~VM_PROT_ALL) == 0, ("invalid prot %x", prot));
if (prot == VM_PROT_NONE) {
pmap_remove(pmap, sva, eva);
return;
}

3
sys/i386/i386/pmap.c
View File

@ -3161,7 +3161,8 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
pt_entry_t *pte;
boolean_t anychanged, pv_lists_locked;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
KASSERT((prot & ~VM_PROT_ALL) == 0, ("invalid prot %x", prot));
if (prot == VM_PROT_NONE) {
pmap_remove(pmap, sva, eva);
return;
}